Date: Mon, 26 May 2008 21:02:14 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Matthew Dillon" <dillon@apollo.backplane.com>, "Kris Kennaway" <kris@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Using sendmsg for SCM_CREDS results in EINVAL on PF_INET socket Message-ID: <7EB9398C5B46415B96D2C20A2E261E13@multiplay.co.uk> References: <BCBAE9EA84D54762AD983B29B2752492@multiplay.co.uk><483B05DB.3000309@FreeBSD.org> <200805261936.m4QJaS7Q074045@apollo.backplane.com>
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----- Original Message -----
From: "Matthew Dillon" <dillon@apollo.backplane.com>
>>>
>>>[...]
>>>confirmed :-)
>>>
>:> using the following code to send credentials to a remote host
> :> results in EINVAL from sendmsg.
> :>
> :> I suspect that SCM_CREDS is only valid for PF_LOCAL / PF_UNIX
> :> sockets and not PF_INET sockets and hence the code in dbus
> :> is actually invalid.
> :>
> :> Can anyone confirm this is the case or not?
> :
> :What would it even mean to send credentials to a remote host over an
> :AF_INET socket?
> :
> :Kris
>
> The only way to do it is to do a connect-back to a secure port. In
> otherwords, to use the identd protocol.
>
> Control messages like SCM_CREDS (and descriptor passing for that matter)
> only work over local protocol sockets.
Thank you for the confirmation guys. I'll look to create a patch
I can submit to the dbus project to disable the use of SCM_CREDS
when using PF_UNIX sockets.
Regards
Steve
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